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A carbonitriding surface treatment method for piston rings using liquid-phase arc discharge

An arc discharge and carbonitriding technology, applied in metal material coating process, coating, solid diffusion coating and other directions, to achieve the effect of high fatigue strength, good lubrication performance and high production efficiency

Active Publication Date: 2019-11-29
YIZHENG RUNYANG MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And when this microscopic deformation cannot be effectively controlled, it may make the piston ring unable to effectively seal the cylinder.

Method used

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  • A carbonitriding surface treatment method for piston rings using liquid-phase arc discharge
  • A carbonitriding surface treatment method for piston rings using liquid-phase arc discharge
  • A carbonitriding surface treatment method for piston rings using liquid-phase arc discharge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] First, the outer diameter surface of the alloy cast iron piston ring obtained after the shaping and cleaning process is polished on metallographic sandpaper to a particle size of 1000#, then the polished piston ring is cleaned with acetone and wiped clean, and then the upper and lower steps of the piston ring are polished. , The inner diameter surface and the end surface are coated with high-temperature resistant insulating varnish, and put into a drying oven to dry at 105°C for 3 hours for later use. Take 1.5L of tap water, add 500g of urea, stir rapidly until it is completely dissolved, pour it into a container, add tap water to 2L and mix evenly to obtain a reaction solution. Connect the pretreated piston ring and the inert electrode to the cathode and anode wires respectively, then immerse in the prepared solution, apply voltage to 360V, keep the pressure in the container at 0.8bar, and treat for 5min to obtain a thickness of 80μm In the penetration layer, the micro...

Embodiment 2

[0055] First, the outer diameter surface of the alloy cast iron piston ring obtained after the shaping and cleaning process is polished on metallographic sandpaper to a particle size of 1000#, then the polished piston ring is cleaned with acetone and wiped clean, and then the upper and lower steps of the piston ring are polished. , The inner diameter surface and the end surface are coated with high-temperature resistant insulating varnish, and put into a drying oven to dry at 105°C for 3 hours for later use. Take 1.5L of tap water, add 800g of urea, stir rapidly until it is completely dissolved, pour it into a container, add tap water to 2L and mix evenly to obtain a reaction solution. Connect the pretreated piston ring and the inert electrode to the cathode and anode wires respectively, then immerse in the prepared solution, apply a voltage of 400V, keep the pressure in the container at 1bar, and treat for 10min to obtain a thickness of 120μm. In the permeable layer, the micr...

Embodiment 3

[0057] First, the outer diameter surface of the alloy cast iron piston ring obtained after the shaping and cleaning process is polished on metallographic sandpaper to a particle size of 1000#, then the polished piston ring is cleaned with acetone and wiped clean, and then the upper and lower steps of the piston ring are polished. , The inner diameter surface and the end surface are coated with high-temperature resistant insulating varnish, and put into a drying oven to dry at 105°C for 3 hours for later use. Take 1.5L of tap water, add 500g of urea, stir rapidly until it is completely dissolved, pour it into a container, add tap water to 2L and mix evenly to obtain a reaction solution. Connect the pretreated piston ring and the inert electrode to the cathode and anode wires respectively, then immerse in the prepared solution, apply voltage to 420V, keep the pressure in the container at 1.6bar, and treat for 5min to obtain a thickness of 100μm. The penetration layer, the covera...

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Abstract

The invention discloses a piston ring carbonitriding surface treatment method adopting liquid phase arc discharge. The method includes the steps that in a pressure-adjustable vessel containing solutions with specific compositions and concentrations, a piston ring to be treated serves as a cathode, an inert electrode material serves as an anode, direct-current impulse voltages are applied between the cathode and the anode, arc discharge is formed on the contact interface of the solutions and the piston ring, the solutions are ionized to produce plasmas containing carbon and nitrogen ions, the plasmas bears a combination reaction with the piston ring and diffuse into a workpiece, and carbonitriding is realized. Pressure waves produced by rupture of plasma bubbles are used for shaping rough and uneven micro-modelling on the surface of the piston ring. The pressure in the vessel is adjuted to control the formation amount and the critical rupture pressure of the plasma bubbles to improve the quality of surface treatment. The method is good in environment suitability, high in treatment speed and production efficiency, low in cost, energy-saving and environment-friendly. The piston ring treated by adopting the method has the advantages of being high in abrasion resistance, corrosion resistance, good in lubricating performance, high in fatigue strength and the like.

Description

technical field [0001] The invention relates to the technical field of internal combustion engines and steel surface treatment, in particular to a piston ring carbonitriding surface treatment method using liquid-phase arc discharge. Background technique [0002] Piston ring is an important part of the internal combustion engine, and its surface treatment process has an important impact on the reliability, durability, economy and environmental performance of the internal combustion engine. Carbonitriding treatment on the outer surface of the piston ring can improve the wear resistance, fatigue strength and corrosion resistance of the piston ring to prolong its service life. Traditional carbonitriding treatment generally needs to be carried out under high temperature conditions, and the required treatment time is long, the production efficiency is low, and the energy consumption is relatively high. [0003] Liquid phase arc discharge carbonitriding is a new steel surface trea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C8/56C23C8/04
CPCC23C8/04C23C8/56
Inventor 陶俊陈晨梅德清赵卫东刘久群朱宗宁姚江微
Owner YIZHENG RUNYANG MACHINERY
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